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Thesis Are Thanked for Their Cooperation UvA-DARE (Digital Academic Repository) Facultative river dolphins : conservation and social ecology of freshwater and coastal Irrawaddy dolphins in Indonesia Kreb, D. Publication date 2004 Document Version Final published version Link to publication Citation for published version (APA): Kreb, D. (2004). Facultative river dolphins : conservation and social ecology of freshwater and coastal Irrawaddy dolphins in Indonesia. Universiteit van Amsterdam. General rights It is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulations If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. UvA-DARE is a service provided by the library of the University of Amsterdam (https://dare.uva.nl) Download date:04 Oct 2021 Facultativee River Dolphins m m nservationn and Social Ecology of Freshwater andd Coastal Irrawaddy Dolphins in Indonesia FACULTATIVE RIVER DOLPHINS: CONSERVATION AND SOCIAL ECOLOGY OF FRESHWATER AND COASTAL IRRAWADDY DOLPHINS IN INDONESIA ISBN: 90-76894-51-5 This research was carried out at the Institute for Biodiversity and Ecosystem Dynamics (IBED)/ Zoölogisch Museum Amsterdam (ZMA) Cover photo : Daniëlle Kreb Cover design : Jan van Arkel Printed by : Febodruk B.V., Enschede Financial support for printing received from: J.E. Jurriaanse Stichting and IBED Copyright © D. Kreb 2004 FACULTATIVE RIVER DOLPHINS: CONSERVATION AND SOCIAL ECOLOGY OF FRESHWATER AND COASTAL IRRAWADDY DOLPHINS IN INDONESIA ACADEMISCH PROEFSCHRIFT Ter verkrijging van de graad van doctor aan de Universiteit van Amsterdam op gezag van de Rector Magnificus prof. mr. P.F. van der Heijden ten overstaan van een door het college voor promoties ingestelde commissie, in het openbaar te verdedigen in de Aula der Universiteit op dinsdag 9 november 2004, te 14.00 uur door Daniëlle Kreb geboren te Emmeloord, Noordoostpolder Promotiecommissie: Promotor: Prof. dr. F.R. Schram Commissieleden: Prof. dr. S.B.J. Menken Prof. dr. W. Admiraal Prof. dr. P.H. van Tienderen Prof. dr. H.H.T. Prins Prof. dr. J.F. Borsani Dr. C. Smeenk Faculteit: Natuurwetenschappen, Wiskunde en Informatica Instituut: Instituut voor Biodiversiteit en Ecosysteem Dynamica Untuk mas Budi dan Jannah By Hari Moelyono TABLE OF CONTENTS ACKNOWLEDGEMENTS……………………………………………………….i SECTION I. GENERAL BACKGROUND Chapter 1. A general introduction into the phenomenon of facultative river dolphins and the species Orcaella brevirostris………………………….1 Chapter 2. Observations on the occurrence of the Irrawaddy dolphin, Orcaella brevirostris, in the Mahakam River, East Kalimantan, Indonesia…….11 Zeitschrift für Säugetierkunde 64: 54-58, 1999 Chapter 3. Cetacean diversity and habitat preferences in tropical waters of East Kalimantan, Indonesia……………………………………….19 With Budiono, submitted manuscript SECTION II. SURVEY TECHNIQUES FOR ABUNDANCE ESTIMATION Chapter 4. Density and abundance of the Irrawady dolphin, Orcaella brevirostris, in the Mahakam River of East Kalimantan, Indonesia: A comparison of survey techniques………………………………..35 The Raffles Bulletin of Zoology, Supplement 10: 85-95, 2002 Chapter 5. Abundance of freshwater Irrawaddy dolphins in the Mahakam River in East Kalimantan, Indonesia, based on mark-recapture analysis of photo-identified individuals……………………………59 In press: Journal of Cetacean Research and Management, 2004 SECTION III. SOCIAL ECOLOGY AND CONSERVATION OF IRRAWADDY RIVER DOLPHINS Chapter 6. Conservation management of small core areas: Key to survival of a critically endangered population of Irrawaddy River dolphins in Borneo………………………………………………………....81 With Budiono, in press: Oryx, 2004 Chapter 7. Living under an aquatic freeway: Effects of boats on Irrawaddy dolphins (Orcaella brevirostris) in a coastal and riverine environment in Indonesia….…………….……………………………………..105 With Karen D. Rahadi, in press: Aquatic Mammals, 2004 Chapter 8. Marked declines in populations of Irrawaddy dolphins…………...127 With Brian D. Smith and Isabel Beasley, Oryx 37: 401 Chapter 9. Social dynamics of facultative Irrawaddy River dolphins (Orcaella brevirostris) in Borneo: Impacts of habitat…………………………133 Submitted manuscript Chapter 10. Impacts of habitat on the acoustics of coastal and freshwater Irrawaddy dolphins, Orcaella brevirostris in East Kalimantan, Indonesia…………………………………….…………………...161 With Junio F. Borsani SECTION IV. GENERAL DISCUSSION- POPULATIONS AND LONG-TERM PROGNOSIS FOR SURVIVAL Chapter 11. Freshwater distribution of Irrawaddy dolphins based on river “vagrancy” or allopatric “speciation”?……………………………185 Chapter 12. Predicting long-term survival of riverine Irrawaddy dolphins (Orcaella brevirostris) in East Kalimantan using Population Viability Analysis ………………………………………………...199 APPENDIX I Irrawaddy dolphins in the Mahakam River, Indonesia…………213 APPENDIX II Monitor and evaluate ongoing threats to the Irrawaddy Dolphins in the Mahakam River of Indonesia…………………215 Appendix 1, pp. 88-89; Appendix 2, p. 56 in: R.R. Reeves, B.D. Smith, E.A. Crespo and G.N. di Sciara (eds.) (2003). 2002-2010 Conservation Action Plan for the World’s Cetaecans. Dolphins, whales and porpoises. IUCN, Gland, Switzerland SUMMARY Facultative river dolphins: Conservation and social ecology of freshwater and coastal populations of Irrawaddy dolphins in Indonesia …….………………………………………………….217 SAMENVATTING Facultatieve rivierdolfijnen: Bescherming en sociale ecologie van zoet- en zoutwater populaties van Irrawaddy dolfijnen, Orcaella brevirostris in Oost Kalimantan, Indonesië………….221 RINGKASAN Lumba-lumba sungai: Konservasi dan sosial ekologi dari populasi lumba-lumba Irrawaddy, Orcaella brevirostris pada air tawar dan laut di Kalimantan Timur, Indonesia………………………………….225 CURRICULUM VITAE………………………………………………………...229 Preface and acknowledgements PREFACE AND ACKNOWLEDGEMENTS This research began with a simple telephone call from Indonesia to Scotland, where at that time I was assisting a radio-tracking study on wildcats, by my good friend and colleague Vincent Nijman who asked me if I knew that there were river dolphins in the Mahakam River in East Kalimantan (for which tip I owe him). Since I so far had only heard about the obligate river dolphins in the Amazon, Ganges, Indus and Yangtze Rivers, which had already captured my interest and imagination, I was surprised and interested to find out more about it. From the sides of the Provincial Wildlife Conservation Department of East Kalimantan (BKSDA Kaltim) and WWF Indonesia (thanks to former staff member Ron Lilley), there was an interest to conduct a preliminary survey in the freshwater dolphins in the Mahakam, which were locally referred to as the pesut. Thanks to the help of Dr Peter J.H. van Bree, Curator Emeritus of the Zoological Museum of Amsterdam, who helped me prepare a proposal to join the survey and find a sponsor through Marc Argeloo and Jikkie Jonkman from WNF Nederland, I soon flew off on my way to meet my first river dolphin in real. I should say that my first observation of the dolphins thrilled me with admiration and I felt that this survey was not to be my last one especially after the numbers we encountered during the survey were rather low and visible threats were numerous. The research really had to be started from the scratch as no previous systematic studies on Irrawaddy dolphins in East Kalimantan had been done upon which to build. The difficulties in studying cetaceans in general is that it requires a great deal of organisation and preparation in order to work as efficiently as possible because of the use of boats, which sometimes is an unpredictable and costly factor. Some creativity and patience was required at times when the working schedule needed to be adjusted when dealing with engine problems or during bad weather conditions, especially at sea where lack of freshwater also was problematic at times. During this research I have not only learned a lot about dolphins, boats, rivers and seas, but also about local human cultures, of which I found the mutual respect and hospitality that I encountered heart warming. My impressions, which turned out to be realistic based on interviews, were that many fishermen in the Mahakam actually had an appreciation for the dolphins and did not wish the dolphins to disappear from the river This encouraged me in my attempts to set up a conservation program. A range of activities focusing on increasing local awareness of the younger generation, fishermen, politics i Preface and acknowledements and society in general, have been conducted since late 2000 until now by the local NGO Yayasan Konservasi RASI (Conservation Foundation for Rare Aquatic Species of Indonesia). I am most grateful to my promoter Professor Frederick R. Schram for taking this project on his shoulders and for his enduring support and scientific guidance. All my manuscripts have been commented and corrected by him. In this regard, a special note of thanks should go to Dr. Arne Mooers, who brought Fred and
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